The ThinkPad Battery 55+ (6 Cell) and ThinkPad Battery 55++ (9 Cell) are rechargeable system batteries that can be used as replacement for aging system batteries or as a convenient spare battery.

The ThinkPad Battery 55+ (6 Cell) (57Y4185) features:

• Lithium-Ion (Li-Ion) technology
• Six-cell, rechargeable system battery, 57Wh
• Standard system battery specifications
• Over-discharge protection
• Compatible with the ThinkPad External Battery Charger (40Y7625)

The ThinkPad Battery 55++ (9 Cell) (57Y4186) features:

• Lithium-Ion (Li-Ion) technology
• Nine-cell, rechargeable system battery, 94Wh
• Standard system battery specifications
• Over-discharge protection
• Compatible with the ThinkPad External Battery Charger (40Y7625)

ThinkPad Battery 55+ (6 Cell) (57Y4185):

• Approximate height: 20 mm (0.8 in)
• Approximate width: 206 mm (8.2 in)
• Approximate depth: 56 mm (2.2 in)
• Weight: 0.34 kg (0.75 lb)

ThinkPad Battery 55++ (9 Cell) (57Y4186):

• Approximate height: 21 mm (0.8 in)
• Approximate width: 218 mm (8.6 in)
• Approximate depth: 79 mm (3.1 in)
• Weight: 0.50 kg (1.10 lb)

ThinkPad Battery 55+ (6 Cell) (57Y4185) packaged in a carton:

• Approximate height: 48 mm (1.9 in)
• Approximate width: 295 mm (11.6 in)
• Approximate depth: 132 mm (5.2 in)
• Weight: 0.46 kg (1.01 lb)

ThinkPad Battery 55++ (9 Cell) (57Y4186) packaged in a carton:

• Approximate height: 48 mm (1.9 in)
• Approximate width: 295 mm (11.6 in)
• Approximate depth: 132 mm (5.2 in)
• Weight: 0.63 kg (1.38 lb)

• Temperature: 5 deg to 35 deg C (41 deg to 95 deg F)
• Relative humidity: 8% to 95%
• Shock: 50cm free drop
• Vibration (Random RMS): 1.04 G (2 Hz to 200 Hz)

1 year - Customer Replacement Unit (CRU) Service

• Announce date: 30 Mar 2010 (Worldwide)
• Availability date: 30 Mar 2010 (Worldwide)
• Discontinued, no longer available: July 2012. Replaced by ThinkPad Battery 70+ (6 cell), ThinkPad Battery 70++

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